Does breastfeeding cause the mother to have a lower immune system?

You are very susceptible to illness in that first few months or so when you are exhausted, tapped out & likely not taking nearly as good of care of yourself as you are of that baby! Make sure you are eating as balanced as you can & taking vitamins!!! I have been breastfeeding now for almost 3 yrs non stop & I was ONLY sick early on. So no - the lactation alone does NOT make you prone to illness...but exhaustion sure does! (Take a nap) :)

Lowered Immune System Causes

It is more likely that your immune system is down because you are being too active too soon after having your baby. Breastfeeding should not be the sole cause of a lowered immune system. (or the cause at all, for that matter!!) Just relax more and work less.

Speedy Recovery : ) .

Breastfeeding wouldn't lower your immune system, it wouldn't change it at all. But being tired and not taking vitamins, along with not eating as healthy as you could(especially since your body is giving vitamins and minerals you need to baby) are all things that come along with having a baby and those could all effect your immune system.

Breastfeeding does not lower your immune system. Drink plenty of fluids. Sleep as much as you need to and eat healthy foods.

"Does breastfeeding cause the mother to have a lower immune system?"

no

but the exhaustion of caring for an infant does.

No, but sleep deprivation and not eating right will which is common in the first few months of motherhood.